groovy_test reports could not find class - unit-testing

Question

I run into some problems when trying to use rules_groovy.
Minimal steps to reproduce:
git clone https://github.com/Vertexwahn/BazelDemos
cd BazelDemos
cd GroovyDemo
bazel test //...
In the case you have not installed Bazel you can installed it on a Ubuntu 20.04 machine this way:
echo "deb [arch=amd64] http://storage.googleapis.com/bazel-apt stable jdk1.8" | sudo tee /etc/apt/sources.list.d/bazel.list
curl https://bazel.build/bazel-release.pub.gpg | sudo apt-key add -
sudo apt-get update && sudo apt-get install -y bazel
The problem:
When I run bazel test //... I get the following error:
JUnit version 4.12
.E
Time: 0.001
There was 1 failure:
1) initializationError(org.junit.runner.JUnitCommandLineParseResult)
java.lang.IllegalArgumentException: Could not find class [HelloWorldTest]
at org.junit.runner.JUnitCommandLineParseResult.parseParameters(JUnitCommandLineParseResult.java:102)
at org.junit.runner.JUnitCommandLineParseResult.parseArgs(JUnitCommandLineParseResult.java:50)
at org.junit.runner.JUnitCommandLineParseResult.parse(JUnitCommandLineParseResult.java:44)
at org.junit.runner.JUnitCore.runMain(JUnitCore.java:72)
at org.junit.runner.JUnitCore.main(JUnitCore.java:36)
Caused by: java.lang.ClassNotFoundException: HelloWorldTest
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:398)
at org.junit.internal.Classes.getClass(Classes.java:16)
at org.junit.runner.JUnitCommandLineParseResult.parseParameters(JUnitCommandLineParseResult.java:100)
... 4 more
FAILURES!!!
Tests run: 1, Failures: 1
Details to setup:
My setup looks like this:
.bazelverion
5.1.0
WORKSPACE.bazel
# rules_groovy
load("#bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
http_archive(
name = "io_bazel_rules_groovy",
sha256 = "a0714e766ba6584432a85697849b2b4f8f56ac634777441d8854a122f07798d2",
strip_prefix = "rules_groovy-e110fbce55bad3b2db067198f339e719244f91b7",
url = "https://github.com/bazelbuild/rules_groovy/archive/e110fbce55bad3b2db067198f339e719244f91b7.tar.gz",
)
load("#io_bazel_rules_groovy//groovy:repositories.bzl", "rules_groovy_dependencies")
rules_groovy_dependencies()
src/test/groovy/BUILD.bazel
load("#io_bazel_rules_groovy//groovy:groovy.bzl", "groovy_test")
groovy_test(
name = "HelloWorldTest",
srcs = ["HelloWorldTest.groovy"],
)
src/test/groovy/HelloWorldTest.groovy
package src.test.groovy
import groovy.util.GroovyTestCase
class HelloWorldTest extends GroovyTestCase {
void testAssertions() {
assertTrue(1 == 1)
}
}
It reports that class HelloWorldTest can not be found.
Any hints what I am doing wrong here?
What do I need to change to get a working Groovy unit test working?
My expectation is that the unit test succeeds.
(BTW: I am using Ubuntu 20.04)
EDIT:
I also tried to make use of groovy_junit_test by modifing the BUILD.bazel file this way:
load("#io_bazel_rules_groovy//groovy:groovy.bzl", "groovy_junit_test")
groovy_junit_test(
name = "HelloWorldTest",
tests = ["HelloWorldTest.groovy"],
)
bazel test //... gives me:
exec ${PAGER:-/usr/bin/less} "$0" || exit 1 Executing tests from
//src/test/groovy:HelloWorldTest
----------------------------------------------------------------------------- JUnit version 4.12 .E Time: 0 There was 1 failure: 1)
initializationError(org.junit.runner.JUnitCommandLineParseResult)
java.lang.IllegalArgumentException: Could not find class
[HelloWorldTest] at
org.junit.runner.JUnitCommandLineParseResult.parseParameters(JUnitCommandLineParseResult.java:102)
at
org.junit.runner.JUnitCommandLineParseResult.parseArgs(JUnitCommandLineParseResult.java:50)
at
org.junit.runner.JUnitCommandLineParseResult.parse(JUnitCommandLineParseResult.java:44)
at org.junit.runner.JUnitCore.runMain(JUnitCore.java:72) at
org.junit.runner.JUnitCore.main(JUnitCore.java:36) Caused by:
java.lang.ClassNotFoundException: HelloWorldTest at
java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
at
java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
at java.base/java.lang.Class.forName0(Native Method) at
java.base/java.lang.Class.forName(Class.java:398) at
org.junit.internal.Classes.getClass(Classes.java:16) at
org.junit.runner.JUnitCommandLineParseResult.parseParameters(JUnitCommandLineParseResult.java:100)
... 4 more
FAILURES!!! Tests run: 1, Failures: 1

Answer 1

use groovy_junit_test instead of groovy_test
according to documentation and source code groovy_test is just a test runner
when groovy_junit_test compiles sources and then calls groovy_test